books.google.com - To protect their peaceful lands, the Dragon Clan will need help from the magical elemental dragon swords, each of whom chooses its own master. But if the Dragon Knights are to defeat the Demon Army, they will have to conquer their own personal demons first....https://books.google.com/books/about/Dragon_Knights.html?id=QqdF9YCvwEcC&utm_source=gb-gplus-shareDragon Knights

Dragon Knights, Volume 15

To protect their peaceful lands, the Dragon Clan will need help from the magical elemental dragon swords, each of whom chooses its own master. But if the Dragon Knights are to defeat the Demon Army, they will have to conquer their own personal demons first.